摘要
以2003年的中国第2次北极科学考察的海冰物理过程调查数据为依据，分析了海冰动力学特征并给出体现动力学特征的定量参数。这些参数指出：现场调查的海冰密集度同NOAA冰图上的密集度相比低2—3成．而厚度比1999年的中国首次北极考察结果减少2m；冰层底面起伏方差约是冰层表面积雪起伏方差的3．8倍；浮冰最快以1300m／h速度运动并伴随振荡旋转。实测浮冰向东北运动时，旋转角度增加，最大达到37．8°，东南方向旋转时，角度减小；浮冰运动的振荡周期为12.45h，同该纬度惯性流振荡周期一致，体现出惯性流对浮冰运动的贡献。
Based on the investigated data of sea ice physical processes during the Second Chinese National Arctic Research Expedition （CHINARE-2003） in the summer of 2003, the sea ice dynamical characteristics are analyzed and the parameters expressing these characteristics are given. From these parameters, the new findings are： （1）The ice density from investigation is lower than 2 - 3 tenths compared with that from NOAA lee Chart, and the ice thickness in the summer is less than 2 m compared with the results investigated during the First Chinese National Arctic Research Expedition in 1999 （CHINARE-1999） ; （2） The standing deviation of ice bottom fluctuation is 3.8 times of that of the snow surface on the ice sheet and （3） the maximum speed of ice floe CHIS7 is 1 300 m/h in rotation and oscillation. While the floe moves toward North-east, the rotation angle increases step by step with the maximum of 37.8°, and while the floe moves toward South-east, its rotation angle decreases step by step. The oscillation period of the floe is 12.45 h consistent with that of the inertia current at the same latitude, which shows the contribution of the inertia current to the ice floe movement.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2007年第2期193-197,共5页
Advances in Water Science
基金
国家自然科学基金资助项目(40233032)
科技基础性工作和社会公益研究专项资助项目(2003DEBSJ057)~~
关键词
北极
海冰
密集度
厚度
粗糙度
旋转
Arctic
sea ice
ice concentration
thickness
roughness
rotation
